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Subnetter Documentation

Subnetter Guides

Welcome to the Subnetter guides section! Here you’ll find practical, hands-on guides for implementing Subnetter in various scenarios. These guides provide detailed configurations, best practices, and real-world examples to help you get the most out of Subnetter.

Available Guides

Hierarchical CIDR Allocation for Multi-Cloud Networks

A detailed exploration of how Subnetter’s hierarchical approach to IP address allocation solves complex networking challenges. This guide covers:

  • Solving IP addressing challenges across multiple cloud providers and accounts
  • Dramatic simplification of firewall and security group rules
  • Example configurations for multi-cloud and multi-account scenarios
  • Operational benefits of hierarchical allocation at scale
  • Best practices for implementing a hierarchical addressing scheme

This guide is ideal for network architects and cloud engineers managing complex environments who want to reduce operational complexity and create a scalable network foundation.

Kubernetes Network Design

A comprehensive guide to designing multi-availability zone Kubernetes network architectures. This guide covers:

  • The 3-AZ high availability architecture pattern
  • Optimal subnet sizing for Kubernetes deployments
  • IP space efficiency analysis and recommendations
  • Implementation strategies with Subnetter
  • Real-world examples with specific CIDR allocations

This guide is particularly useful for organizations running Kubernetes workloads across multiple availability zones who need to ensure high availability while efficiently utilizing IP address space.

NetBox Integration

Export your Subnetter allocations to NetBox for centralized IP address management. This guide covers:

  • Connecting Subnetter to your NetBox instance
  • Understanding the NetBox object hierarchy (Aggregates, Site Groups, Sites, Locations, Prefixes)
  • Using the netbox-export CLI command
  • Idempotent exports and best practices
  • Setting up a local NetBox development environment

This guide is essential for organizations using NetBox as their source of truth for IP address management who want to integrate their planning workflow with their IPAM system.

Best Practices

Comprehensive best practices for IP address planning and CIDR allocation. This guide covers:

  • Planning strategies for different organization sizes
  • Cloud provider-specific considerations and limits
  • Avoiding common pitfalls
  • Documentation and governance recommendations

Coming Soon

We’re working on additional guides that will cover:

  • Multi-Cloud CIDR Allocation Strategy
  • Automating Network Deployment with Terraform
  • IPv4 to IPv6 Migration Planning
  • Enterprise Network Design for Large Organizations

Contributing

Have a use case you’d like to see documented? Consider contributing a guide by submitting a pull request to our GitHub repository.